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Events on Thursday, June 8th, 2023

R. G. Herb Condensed Matter Seminar
Diode effects in current-biased Josephson junctions
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Jacob F. Steiner, Caltech
Abstract: Current-biased Josephson junctions exhibit hysteretic transitions between dissipative and superconducting states as characterized by switching and retrapping currents. Here, we develop a theory for diodelike effects in the switching and retrapping currents of weakly damped Josephson junctions. We find that while the diodelike behavior of switching currents is rooted in asymmetric current-phase relations, nonreciprocal retrapping currents originate in asymmetric quasiparticle currents. These different origins also imply distinctly different symmetry requirements. We illustrate our results by a microscopic model for junctions involving a single magnetic atom. Our theory provides significant guidance in identifying the microscopic origin of nonreciprocities in Josephson junctions.
Host: Alex Levchenko
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